FOSS gamedev and creative worlds

It can take 5 minutes to logon to a Minetest server. If you have a family playing, and someone leaves and someone wants to use their computer, they have to "exit to menu" to logon, and it takes another 5 minutes as everything is reloaded. Can't there be an ingame way of changing who is logged on to a server without having to reload everything? Maybe a special chat command /logoff and /logon? Hopefully the person won't type their password into public chat!

No, that goes against the basic system.
Why does reconnecting take so long for you? Once all the media is downloaded and cached it shouldnt take so long.

If they ever implement server-to-server teleportation (unlikely) then I suppose such a function could be used to reconnect to the same server with different creds.